I am not a huge fan of voice chat programs either. They have their uses, one cannot deny that. There is no way to be as organized or able to quickly adapt to situations than voice chat. But there tends to be huge drawbacks as well.
They are terrible for game immersion. I have no issue using Raidcall or Mumble or Vent etc while doing a guild activity like a hard dungeon, or a raid. But then I shut it off. Some people like to hang out in it all day and just gossip or talk about mindless real life issues. I respect their interest in doing so, but that isn't for me. I like the game. I enjoy the sights and the sounds of the environment. I play an RPG game to get away from real life, not to chat about it
The other drawback that I have seen several times is this: Guilds that use voice chat a lot tend to ignore the people that aren't in it. Everything tends to get planned around voice chat and not even mentioned in normal guild chat. It can drive a wedge in between people who do and don't use it.
But all that being said, you can pretty easily find a mature guild with similar interests and age brackets. So it is very possible to voice chat with people your own age while gaming.